status-go/rtt/README.md

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# Description
This module is used by the Status app to select mailservers based on their RTT(Round Trip Time).
It is exposed via the JSON RPC endpoint in the [`services/mailservers/tcp_ping.go`](../services/mailservers/tcp_ping.go) file.
# Usage
The simplest way to use the `mailserver_Ping` RPC command is using `curl`.
The call takes one struct argument which contains two attributes:
* `addresses` - A list of `enode` addresses to ping.
* `timeoutMs` - Call timeout given in milliseconds.
The return value consists of a list of objects representing a result for each mailserver, each containing following attributes:
* `address` - The `enode` address of given mailserver.
* `rttMs` - Round Trip Time given in milliseconds. Set to `null` in case of an error.`
* `error` - A text of error that caused the ping failure.
# Example
```bash
$ cat >payload.json <<EOL
{
"jsonrpc": "2.0",
"method": "mailservers_ping",
"params": [
{
"addresses": [
"enode://c42f368a23fa98ee546fd247220759062323249ef657d26d357a777443aec04db1b29a3a22ef3e7c548e18493ddaf51a31b0aed6079bd6ebe5ae838fcfaf3a49@206.189.243.162:443",
"enode://c42f368a23fa98ee546fd247220759062323249ef657d26d357a777443aec04db1b29a3a22ef3e7c548e18493ddaf51a31b0aed6079bd6ebe5ae838fcfaf3a49@206.189.243.162:999"
],
"timeoutMs": 500
}
],
"id": 1
}
EOL
$ curl -s localhost:8545 -H 'content-type: application/json' -d @payload.json
```
```json
{
"jsonrpc": "2.0",
"id": 1,
"result": [
{
"address": "enode://c42f368a23fa98ee546fd247220759062323249ef657d26d357a777443aec04db1b29a3a22ef3e7c548e18493ddaf51a31b0aed6079bd6ebe5ae838fcfaf3a49@206.189.243.162:443",
"rtt_ms": 31,
"error": null
},
{
"address": "enode://c42f368a23fa98ee546fd247220759062323249ef657d26d357a777443aec04db1b29a3a22ef3e7c548e18493ddaf51a31b0aed6079bd6ebe5ae838fcfaf3a49@206.189.243.162:999",
"rtt_ms": null,
"error": "tcp check timeout: I/O timeout"
}
]
}
```
# Links
* https://github.com/status-im/status-react/issues/9394
* https://github.com/status-im/status-go/pull/1672
* https://github.com/status-im/tcp-shaker